A person, often a woman, who finds the trashy- coulnd't care less- look Very attractive!!! E.g. to meet a man on the street, looking like he woke up in a dumpster that morning with he's ripped- never washed jeans, t-shirt, preferably a big beard, sunglasses and some "casual shoes" would be a true treasure of the day for a dumpster diver! (tattoos are often plus).

-Oh my goood!!!.... Did you just see that dude over there!?
-Dude, he was like homeless I think....
-Oh... Don't know if I care though!
-You are such a dumpster diver!

"Dumpster" is tacked on to the word "diver." A "diver" is short for "muff diver." When one adds "dumpster" to it, then the conotation is obvious: someone is diving into a cavernous, dirty, nasty ... cavity. But take the origin of "Dumpster!" Usually it has "cum" in front of it (as in "cum dumpster"). So now we can think of an alternate definition as having to do with sloppy seconds, or thirds ... or more. When "diving" in this manner, there is usually an echo and vile residue involved.

My face was all sticky and covered in pecker snot at that party last night when I decided to be a dumpster diver with that nasty skank.